1.A 2.6kg book sits rest on a flat desk. 2.A 1.9kg book sits at rest on a flat desk. A student pushes the book on to the right, but the book is held in place by static friction.

3.A 2.4kg book slides across a flat desk accelerating at .25m/s^2 to the right. A student is pushing the book on to the right, but the book is experiencing a frictional force.

4. A rocket lifts off Earth’s surface, accelerating upward at 7.4m/s^2. Its engines generate 1,300N of thrust. What is the mass of the rocket?(ignore wind resistance)

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative